[thirdparty/systemd.git] / src / logind-user.c

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2011 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <string.h>
#include <unistd.h>
#include <errno.h>

#include "logind-user.h"
#include "util.h"
#include "cgroup-util.h"
#include "hashmap.h"
#include "strv.h"

User* user_new(Manager *m, uid_t uid, gid_t gid, const char *name) {
        User *u;

        assert(m);
        assert(name);

        u = new0(User, 1);
        if (!u)
                return NULL;

        u->name = strdup(name);
        if (!u->name) {
                free(u);
                return NULL;
        }

        if (asprintf(&u->state_file, "/run/systemd/users/%lu", (unsigned long) uid) < 0) {
                free(u->name);
                free(u);
                return NULL;
        }

        if (hashmap_put(m->users, ULONG_TO_PTR((unsigned long) uid), u) < 0) {
                free(u->state_file);
                free(u->name);
                free(u);
                return NULL;
        }

        u->manager = m;
        u->uid = uid;
        u->gid = gid;

        return u;
}

void user_free(User *u) {
        assert(u);

        if (u->in_gc_queue)
                LIST_REMOVE(User, gc_queue, u->manager->user_gc_queue, u);

        while (u->sessions)
                session_free(u->sessions);

        free(u->cgroup_path);

        free(u->service);
        free(u->runtime_path);

        hashmap_remove(u->manager->users, ULONG_TO_PTR((unsigned long) u->uid));

        free(u->name);
        free(u->state_file);
        free(u);
}

int user_save(User *u) {
        FILE *f;
        int r;
        char *temp_path;

        assert(u);
        assert(u->state_file);

        r = safe_mkdir("/run/systemd/users", 0755, 0, 0);
        if (r < 0)
                goto finish;

        r = fopen_temporary(u->state_file, &f, &temp_path);
        if (r < 0)
                goto finish;

        fchmod(fileno(f), 0644);

        fprintf(f,
                "# This is private data. Do not parse.\n"
                "NAME=%s\n"
                "STATE=%s\n",
                u->name,
                user_state_to_string(user_get_state(u)));

        if (u->cgroup_path)
                fprintf(f,
                        "CGROUP=%s\n",
                        u->cgroup_path);

        if (u->runtime_path)
                fprintf(f,
                        "RUNTIME=%s\n",
                        u->runtime_path);

        if (u->service)
                fprintf(f,
                        "SERVICE=%s\n",
                        u->service);

        if (u->display)
                fprintf(f,
                        "DISPLAY=%s\n",
                        u->display->id);

        fflush(f);

        if (ferror(f) || rename(temp_path, u->state_file) < 0) {
                r = -errno;
                unlink(u->state_file);
                unlink(temp_path);
        }

        fclose(f);
        free(temp_path);

finish:
        if (r < 0)
                log_error("Failed to save user data for %s: %s", u->name, strerror(-r));

        return r;
}

int user_load(User *u) {
        int r;
        char *display = NULL;
        Session *s = NULL;

        assert(u);

        r = parse_env_file(u->state_file, NEWLINE,
                           "CGROUP", &u->cgroup_path,
                           "RUNTIME", &u->runtime_path,
                           "SERVICE", &u->service,
                           "DISPLAY", &display,
                           NULL);
        if (r < 0) {
                free(display);

                if (r == -ENOENT)
                        return 0;

                log_error("Failed to read %s: %s", u->state_file, strerror(-r));
                return r;
        }

        if (display) {
                s = hashmap_get(u->manager->sessions, display);
                free(display);
        }

        if (s && s->display && x11_display_is_local(s->display))
                u->display = s;

        return r;
}

static int user_mkdir_runtime_path(User *u) {
        char *p;
        int r;

        assert(u);

        r = safe_mkdir("/run/user", 0755, 0, 0);
        if (r < 0) {
                log_error("Failed to create /run/user: %s", strerror(-r));
                return r;
        }

        if (!u->runtime_path) {
                p = strappend("/run/user/", u->name);

                if (!p) {
                        log_error("Out of memory");
                        return -ENOMEM;
                }
        } else
                p = u->runtime_path;

        r = safe_mkdir(p, 0700, u->uid, u->gid);
        if (r < 0) {
                log_error("Failed to create runtime directory %s: %s", p, strerror(-r));
                free(p);
                u->runtime_path = NULL;
                return r;
        }

        u->runtime_path = p;
        return 0;
}

static int user_create_cgroup(User *u) {
        char **k;
        char *p;
        int r;

        assert(u);

        if (!u->cgroup_path) {
                if (asprintf(&p, "%s/%s", u->manager->cgroup_path, u->name) < 0) {
                        log_error("Out of memory");
                        return -ENOMEM;
                }
        } else
                p = u->cgroup_path;

        r = cg_create(SYSTEMD_CGROUP_CONTROLLER, p);
        if (r < 0) {
                free(p);
                u->cgroup_path = NULL;
                log_error("Failed to create cgroup "SYSTEMD_CGROUP_CONTROLLER":%s: %s", p, strerror(-r));
                return r;
        }

        u->cgroup_path = p;

        STRV_FOREACH(k, u->manager->controllers) {
                r = cg_create(*k, p);
                if (r < 0)
                        log_warning("Failed to create cgroup %s:%s: %s", *k, p, strerror(-r));
        }

        return 0;
}

static int user_start_service(User *u) {
        assert(u);

        return 0;
}

int user_start(User *u) {
        int r;

        assert(u);

        if (u->started)
                return 0;

        log_info("New user %s logged in.", u->name);

        /* Make XDG_RUNTIME_DIR */
        r = user_mkdir_runtime_path(u);
        if (r < 0)
                return r;

        /* Create cgroup */
        r = user_create_cgroup(u);
        if (r < 0)
                return r;

        /* Spawn user systemd */
        r = user_start_service(u);
        if (r < 0)
                return r;

        /* Save new user data */
        user_save(u);

        dual_timestamp_get(&u->timestamp);

        u->started = true;

        user_send_signal(u, true);

        return 0;
}

static int user_stop_service(User *u) {
        assert(u);

        if (!u->service)
                return 0;

        return 0;
}

static int user_shall_kill(User *u) {
        assert(u);

        if (!u->manager->kill_user_processes)
                return false;

        if (strv_contains(u->manager->kill_exclude_users, u->name))
                return false;

        if (strv_isempty(u->manager->kill_only_users))
                return true;

        return strv_contains(u->manager->kill_only_users, u->name);
}

static int user_kill_cgroup(User *u) {
        int r;
        char **k;

        assert(u);

        if (!u->cgroup_path)
                return 0;

        cg_trim(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false);

        if (user_shall_kill(u)) {

                r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true);
                if (r < 0)
                        log_error("Failed to kill user cgroup: %s", strerror(-r));
        } else {

                r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true);
                if (r < 0)
                        log_error("Failed to check user cgroup: %s", strerror(-r));
                else if (r > 0) {
                        r = cg_delete(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
                        if (r < 0)
                                log_error("Failed to delete user cgroup: %s", strerror(-r));
                } else
                        r = -EBUSY;
        }

        STRV_FOREACH(k, u->manager->controllers)
                cg_trim(*k, u->cgroup_path, true);

        free(u->cgroup_path);
        u->cgroup_path = NULL;

        return r;
}

static int user_remove_runtime_path(User *u) {
        int r;

        assert(u);

        if (!u->runtime_path)
                return 0;

        r = rm_rf(u->runtime_path, false, true);
        if (r < 0)
                log_error("Failed to remove runtime directory %s: %s", u->runtime_path, strerror(-r));

        free(u->runtime_path);
        u->runtime_path = NULL;

        return r;
}

int user_stop(User *u) {
        Session *s;
        int r = 0, k;
        assert(u);

        if (u->started)
                log_info("User %s logged out.", u->name);

        LIST_FOREACH(sessions_by_user, s, u->sessions) {
                k = session_stop(s);
                if (k < 0)
                        r = k;
        }

        /* Kill systemd */
        k = user_stop_service(u);
        if (k < 0)
                r = k;

        /* Kill cgroup */
        k = user_kill_cgroup(u);
        if (k < 0)
                r = k;

        /* Kill XDG_RUNTIME_DIR */
        k = user_remove_runtime_path(u);
        if (k < 0)
                r = k;

        unlink(u->state_file);
        user_add_to_gc_queue(u);

        if (u->started)
                user_send_signal(u, false);

        u->started = false;

        return r;
}

int user_get_idle_hint(User *u, dual_timestamp *t) {
        Session *s;
        bool idle_hint = true;
        dual_timestamp ts = { 0, 0 };

        assert(u);

        LIST_FOREACH(sessions_by_user, s, u->sessions) {
                dual_timestamp k;
                int ih;

                ih = session_get_idle_hint(s, &k);
                if (ih < 0)
                        return ih;

                if (!ih) {
                        if (!idle_hint) {
                                if (k.monotonic < ts.monotonic)
                                        ts = k;
                        } else {
                                idle_hint = false;
                                ts = k;
                        }
                } else if (idle_hint) {

                        if (k.monotonic > ts.monotonic)
                                ts = k;
                }
        }

        if (t)
                *t = ts;

        return idle_hint;
}

int user_check_gc(User *u) {
        int r;
        char *p;

        assert(u);

        if (u->sessions)
                return 1;

        if (asprintf(&p, "/var/lib/systemd/linger/%s", u->name) < 0)
                return -ENOMEM;

        r = access(p, F_OK) >= 0;
        free(p);

        if (r > 0)
                return 1;

        if (u->cgroup_path) {
                r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false);
                if (r < 0)
                        return r;

                if (r <= 0)
                        return 1;
        }

        return 0;
}

void user_add_to_gc_queue(User *u) {
        assert(u);

        if (u->in_gc_queue)
                return;

        LIST_PREPEND(User, gc_queue, u->manager->user_gc_queue, u);
        u->in_gc_queue = true;
}

UserState user_get_state(User *u) {
        Session *i;

        assert(u);

        if (!u->sessions)
                return USER_LINGERING;

        LIST_FOREACH(sessions_by_user, i, u->sessions)
                if (session_is_active(i))
                        return USER_ACTIVE;

        return USER_ONLINE;
}

static const char* const user_state_table[_USER_STATE_MAX] = {
        [USER_OFFLINE] = "offline",
        [USER_LINGERING] = "lingering",
        [USER_ONLINE] = "online",
        [USER_ACTIVE] = "active"
};

DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);
Commit	Line	Data
20263082 LP	1	/-- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil --/
	2
	3	/***
	4	This file is part of systemd.
	5
	6	Copyright 2011 Lennart Poettering
	7
	8	systemd is free software; you can redistribute it and/or modify it
	9	under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	systemd is distributed in the hope that it will be useful, but
	14	WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	20	***/
	21
	22	#include <string.h>
	23	#include <unistd.h>
	24	#include <errno.h>
	25
90821c93	26	#include "logind-user.h"
20263082 LP	27	#include "util.h"
	28	#include "cgroup-util.h"
	29	#include "hashmap.h"
	30	#include "strv.h"
	31
	32	User* user_new(Manager m, uid_t uid, gid_t gid, const char name) {
	33	User *u;
	34
	35	assert(m);
	36	assert(name);
	37
14c3baca	38	u = new0(User, 1);
20263082 LP	39	if (!u)
	40	return NULL;
	41
	42	u->name = strdup(name);
	43	if (!u->name) {
	44	free(u);
	45	return NULL;
	46	}
	47
98a28fef	48	if (asprintf(&u->state_file, "/run/systemd/users/%lu", (unsigned long) uid) < 0) {
20263082 LP	49	free(u->name);
	50	free(u);
	51	return NULL;
	52	}
	53
	54	if (hashmap_put(m->users, ULONG_TO_PTR((unsigned long) uid), u) < 0) {
	55	free(u->state_file);
	56	free(u->name);
	57	free(u);
	58	return NULL;
	59	}
	60
	61	u->manager = m;
	62	u->uid = uid;
	63	u->gid = gid;
	64
	65	return u;
	66	}
	67
	68	void user_free(User *u) {
	69	assert(u);
	70
14c3baca LP	71	if (u->in_gc_queue)
	72	LIST_REMOVE(User, gc_queue, u->manager->user_gc_queue, u);
	73
20263082 LP	74	while (u->sessions)
	75	session_free(u->sessions);
	76
	77	free(u->cgroup_path);
	78
	79	free(u->service);
	80	free(u->runtime_path);
	81
	82	hashmap_remove(u->manager->users, ULONG_TO_PTR((unsigned long) u->uid));
	83
	84	free(u->name);
d2f92cdf	85	free(u->state_file);
20263082 LP	86	free(u);
	87	}
	88
	89	int user_save(User *u) {
	90	FILE *f;
	91	int r;
14c3baca	92	char *temp_path;
20263082 LP	93
	94	assert(u);
	95	assert(u->state_file);
	96
98a28fef	97	r = safe_mkdir("/run/systemd/users", 0755, 0, 0);
20263082	98	if (r < 0)
14c3baca	99	goto finish;
20263082	100
14c3baca LP	101	r = fopen_temporary(u->state_file, &f, &temp_path);
	102	if (r < 0)
	103	goto finish;
	104
	105	fchmod(fileno(f), 0644);
20263082 LP	106
20263082 LP	107	fprintf(f,
14c3baca	108	"# This is private data. Do not parse.\n"
20263082 LP	109	"NAME=%s\n"
	110	"STATE=%s\n",
	111	u->name,
	112	user_state_to_string(user_get_state(u)));
	113
	114	if (u->cgroup_path)
	115	fprintf(f,
	116	"CGROUP=%s\n",
	117	u->cgroup_path);
	118
	119	if (u->runtime_path)
	120	fprintf(f,
	121	"RUNTIME=%s\n",
	122	u->runtime_path);
	123
	124	if (u->service)
	125	fprintf(f,
	126	"SERVICE=%s\n",
	127	u->service);
	128
	129	if (u->display)
	130	fprintf(f,
	131	"DISPLAY=%s\n",
	132	u->display->id);
	133
	134	fflush(f);
14c3baca LP	135
14c3baca LP	136	if (ferror(f) \|\| rename(temp_path, u->state_file) < 0) {
20263082 LP	137	r = -errno;
20263082 LP	138	unlink(u->state_file);
14c3baca	139	unlink(temp_path);
20263082 LP	140	}
	141
	142	fclose(f);
14c3baca LP	143	free(temp_path);
	144
	145	finish:
	146	if (r < 0)
	147	log_error("Failed to save user data for %s: %s", u->name, strerror(-r));
	148
20263082 LP	149	return r;
	150	}
	151
	152	int user_load(User *u) {
	153	int r;
	154	char *display = NULL;
98a28fef	155	Session *s = NULL;
20263082 LP	156
	157	assert(u);
	158
a185c5aa	159	r = parse_env_file(u->state_file, NEWLINE,
20263082 LP	160	"CGROUP", &u->cgroup_path,
	161	"RUNTIME", &u->runtime_path,
	162	"SERVICE", &u->service,
	163	"DISPLAY", &display,
	164	NULL);
	165	if (r < 0) {
	166	free(display);
	167
	168	if (r == -ENOENT)
	169	return 0;
	170
	171	log_error("Failed to read %s: %s", u->state_file, strerror(-r));
	172	return r;
	173	}
	174
98a28fef LP	175	if (display) {
	176	s = hashmap_get(u->manager->sessions, display);
	177	free(display);
	178	}
20263082 LP	179
	180	if (s && s->display && x11_display_is_local(s->display))
	181	u->display = s;
	182
	183	return r;
	184	}
	185
	186	static int user_mkdir_runtime_path(User *u) {
	187	char *p;
	188	int r;
	189
	190	assert(u);
	191
	192	r = safe_mkdir("/run/user", 0755, 0, 0);
	193	if (r < 0) {
	194	log_error("Failed to create /run/user: %s", strerror(-r));
	195	return r;
	196	}
	197
	198	if (!u->runtime_path) {
	199	p = strappend("/run/user/", u->name);
	200
	201	if (!p) {
	202	log_error("Out of memory");
	203	return -ENOMEM;
	204	}
	205	} else
	206	p = u->runtime_path;
	207
	208	r = safe_mkdir(p, 0700, u->uid, u->gid);
	209	if (r < 0) {
	210	log_error("Failed to create runtime directory %s: %s", p, strerror(-r));
	211	free(p);
	212	u->runtime_path = NULL;
	213	return r;
	214	}
	215
	216	u->runtime_path = p;
	217	return 0;
	218	}
	219
	220	static int user_create_cgroup(User *u) {
	221	char **k;
	222	char *p;
	223	int r;
	224
	225	assert(u);
	226
	227	if (!u->cgroup_path) {
	228	if (asprintf(&p, "%s/%s", u->manager->cgroup_path, u->name) < 0) {
	229	log_error("Out of memory");
	230	return -ENOMEM;
	231	}
	232	} else
	233	p = u->cgroup_path;
	234
	235	r = cg_create(SYSTEMD_CGROUP_CONTROLLER, p);
	236	if (r < 0) {
	237	free(p);
	238	u->cgroup_path = NULL;
	239	log_error("Failed to create cgroup "SYSTEMD_CGROUP_CONTROLLER":%s: %s", p, strerror(-r));
	240	return r;
	241	}
	242
243	u->cgroup_path = p;
244
245	STRV_FOREACH(k, u->manager->controllers) {
246	r = cg_create(*k, p);
247	if (r < 0)
248	log_warning("Failed to create cgroup %s:%s: %s", *k, p, strerror(-r));
249	}
250
251	return 0;
252	}
253
254	static int user_start_service(User *u) {
255	assert(u);
256
257	return 0;
258	}
259
260	int user_start(User *u) {
261	int r;
262
263	assert(u);
264
9418f147 LP	265	if (u->started)
	266	return 0;
	267
ed18b08b LP	268	log_info("New user %s logged in.", u->name);
ed18b08b LP	269
20263082 LP	270	/* Make XDG_RUNTIME_DIR */
	271	r = user_mkdir_runtime_path(u);
	272	if (r < 0)
	273	return r;
	274
	275	/* Create cgroup */
	276	r = user_create_cgroup(u);
	277	if (r < 0)
	278	return r;
	279
	280	/* Spawn user systemd */
	281	r = user_start_service(u);
	282	if (r < 0)
	283	return r;
	284
14c3baca LP	285	/* Save new user data */
	286	user_save(u);
	287
20263082 LP	288	dual_timestamp_get(&u->timestamp);
20263082 LP	289
9418f147 LP	290	u->started = true;
9418f147 LP	291
da119395 LP	292	user_send_signal(u, true);
da119395 LP	293
20263082 LP	294	return 0;
	295	}
	296
	297	static int user_stop_service(User *u) {
	298	assert(u);
	299
	300	if (!u->service)
	301	return 0;
	302
	303	return 0;
	304	}
	305
	306	static int user_shall_kill(User *u) {
	307	assert(u);
	308
ed18b08b LP	309	if (!u->manager->kill_user_processes)
	310	return false;
	311
	312	if (strv_contains(u->manager->kill_exclude_users, u->name))
	313	return false;
	314
	315	if (strv_isempty(u->manager->kill_only_users))
	316	return true;
	317
	318	return strv_contains(u->manager->kill_only_users, u->name);
20263082 LP	319	}
	320
	321	static int user_kill_cgroup(User *u) {
	322	int r;
	323	char **k;
	324
	325	assert(u);
	326
	327	if (!u->cgroup_path)
	328	return 0;
	329
	330	cg_trim(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false);
	331
	332	if (user_shall_kill(u)) {
	333
	334	r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true);
	335	if (r < 0)
	336	log_error("Failed to kill user cgroup: %s", strerror(-r));
	337	} else {
	338
	339	r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true);
	340	if (r < 0)
	341	log_error("Failed to check user cgroup: %s", strerror(-r));
	342	else if (r > 0) {
	343	r = cg_delete(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
	344	if (r < 0)
	345	log_error("Failed to delete user cgroup: %s", strerror(-r));
	346	} else
	347	r = -EBUSY;
	348	}
	349
	350	STRV_FOREACH(k, u->manager->controllers)
	351	cg_trim(*k, u->cgroup_path, true);
	352
	353	free(u->cgroup_path);
	354	u->cgroup_path = NULL;
	355
	356	return r;
	357	}
	358
	359	static int user_remove_runtime_path(User *u) {
	360	int r;
	361
	362	assert(u);
	363
	364	if (!u->runtime_path)
	365	return 0;
	366
	367	r = rm_rf(u->runtime_path, false, true);
	368	if (r < 0)
	369	log_error("Failed to remove runtime directory %s: %s", u->runtime_path, strerror(-r));
	370
	371	free(u->runtime_path);
	372	u->runtime_path = NULL;
	373
	374	return r;
	375	}
	376
	377	int user_stop(User *u) {
	378	Session *s;
	379	int r = 0, k;
	380	assert(u);
	381
ed18b08b LP	382	if (u->started)
ed18b08b LP	383	log_info("User %s logged out.", u->name);
9418f147	384
20263082 LP	385	LIST_FOREACH(sessions_by_user, s, u->sessions) {
	386	k = session_stop(s);
	387	if (k < 0)
	388	r = k;
	389	}
	390
	391	/* Kill systemd */
	392	k = user_stop_service(u);
	393	if (k < 0)
	394	r = k;
	395
	396	/* Kill cgroup */
	397	k = user_kill_cgroup(u);
	398	if (k < 0)
	399	r = k;
	400
	401	/* Kill XDG_RUNTIME_DIR */
	402	k = user_remove_runtime_path(u);
	403	if (k < 0)
	404	r = k;
	405
d2f92cdf LP	406	unlink(u->state_file);
	407	user_add_to_gc_queue(u);
	408
ed18b08b LP	409	if (u->started)
	410	user_send_signal(u, false);
	411
9418f147 LP	412	u->started = false;
9418f147 LP	413
20263082 LP	414	return r;
	415	}
	416
a185c5aa LP	417	int user_get_idle_hint(User u, dual_timestamp t) {
	418	Session *s;
	419	bool idle_hint = true;
	420	dual_timestamp ts = { 0, 0 };
	421
	422	assert(u);
	423
	424	LIST_FOREACH(sessions_by_user, s, u->sessions) {
	425	dual_timestamp k;
	426	int ih;
	427
	428	ih = session_get_idle_hint(s, &k);
	429	if (ih < 0)
	430	return ih;
	431
	432	if (!ih) {
	433	if (!idle_hint) {
	434	if (k.monotonic < ts.monotonic)
	435	ts = k;
	436	} else {
	437	idle_hint = false;
	438	ts = k;
	439	}
	440	} else if (idle_hint) {
	441
	442	if (k.monotonic > ts.monotonic)
	443	ts = k;
	444	}
	445	}
	446
	447	if (t)
	448	*t = ts;
	449
	450	return idle_hint;
	451	}
	452
20263082 LP	453	int user_check_gc(User *u) {
	454	int r;
	455	char *p;
	456
	457	assert(u);
	458
	459	if (u->sessions)
	460	return 1;
	461
	462	if (asprintf(&p, "/var/lib/systemd/linger/%s", u->name) < 0)
	463	return -ENOMEM;
	464
	465	r = access(p, F_OK) >= 0;
	466	free(p);
	467
	468	if (r > 0)
	469	return 1;
	470
	471	if (u->cgroup_path) {
	472	r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false);
	473	if (r < 0)
	474	return r;
	475
	476	if (r <= 0)
	477	return 1;
	478	}
	479
	480	return 0;
	481	}
	482
14c3baca LP	483	void user_add_to_gc_queue(User *u) {
	484	assert(u);
	485
	486	if (u->in_gc_queue)
	487	return;
	488
	489	LIST_PREPEND(User, gc_queue, u->manager->user_gc_queue, u);
	490	u->in_gc_queue = true;
	491	}
	492
20263082 LP	493	UserState user_get_state(User *u) {
	494	Session *i;
	495
	496	assert(u);
	497
	498	if (!u->sessions)
	499	return USER_LINGERING;
	500
	501	LIST_FOREACH(sessions_by_user, i, u->sessions)
	502	if (session_is_active(i))
	503	return USER_ACTIVE;
	504
	505	return USER_ONLINE;
	506	}
	507
	508	static const char* const user_state_table[_USER_STATE_MAX] = {
	509	[USER_OFFLINE] = "offline",
	510	[USER_LINGERING] = "lingering",
	511	[USER_ONLINE] = "online",
	512	[USER_ACTIVE] = "active"
	513	};
	514
	515	DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);